Microsoft has today released version 4.0 of its group messaging app GroupMe. The Windows Phone app now supports Windows Phone 8 devices, has a brand new start screen with large animated tiles, an improved chat interface and it's been given a speed boost.

For those new to GroupMe, the app allows you to start group chats and send images to people in your phone contacts. The app uses your data connection by default, however if you have a low connection you have the option to receive messages via SMS. Users can also use the GroupMe website here when not on a smartphone.

While Microsoft is still developing the app, Rooms on Windows Phone 8 has the same functionality but of course isn't multi-platform yet, like GroupMe. It wouldn't be surprising if the app is at some point rolled into Skype.